A friend bought an f2.0 Summicron-M Aspheric for his M7 last year for $1,650.00 AUD last year.

I don't know where he bought it from, but I know that's what he paid for it.

The reason I know this, is because he sold his old Subaru ute for $1,500 to pay for it and needed a loan of $150.00 which he got from his very understanding girlfriend.

That should give you a ball park figure, but this lens was, I believe, on the cheap side, which is why he sold his ute to a car yard inside an hour of hearing about this lens being for sale, then he rang his girlfriend, who happened to be in my darkroom when she took the call.

I'm basically a Nikon person, that is about the extent of my current Leica knowledge.